Grammarly has acquired Superhuman, the once-hyped email productivity startup, moving from a grammar-checking assistant to a wider workplace software suite.
The deal reveals Grammarly’s intent to stake its claim in enterprise productivity, placing it in direct competition with Microsoft 365 and Google Workspace.
Per Reuters, the financial terms of the transaction were not disclosed. However, Superhuman was last valued at $825 million in 2021 and currently generates an estimated $35 million annually.
With over $110 million in venture funding behind it, from names like Andreessen Horowitz and IVP, Superhuman had built a reputation for exclusivity and speed, with features that reportedly helped users send and respond to 72% more emails per hour.
Grammarly, founded in 2005, has gone beyond a grammar tool. After raising $1 billion in non-dilutive funding from General Catalyst in May 2025, the company is transforming into a full-fledged productivity platform.
The acquisition of Coda in late 2024 laid the foundation for AI-powered collaboration, and Superhuman now brings email into the mix.
This acquisition also reveals an organisational change. Rahul Vohra, Superhuman’s CEO, will now join Grammarly’s leadership team, bringing along over 100 Superhuman employees. Yet Superhuman won’t be absorbed entirely. “The Superhuman product, team, and brand will continue,” said Grammarly CEO Shashir Mehrotra.
“It’s a very well-used product by tens of thousands of people, and we want to see them continue to make progress.”
The two companies have an aligned vision of integrating Grammarly’s growing suite of productivity agents into Superhuman. These AI-powered tools are designed to help users summarise threads, generate replies, extract insights from documents, and sync with calendars, all from within the email client.
Vohra described the deal as a catalyst for growth: “This gives us significantly greater resources and allows us to invest more deeply in AI, calendars, tasks, and collaboration.”
With this, Grammarly is placing itself at the centre of a new development where AI assistants that function seamlessly across workflows, including email, documents, calendars, and beyond.
Superhuman will be a testbed for this integration, potentially redefining what a modern email platform can do.
Nonetheless, the email space has become very competitive, with Google’s Gemini-infused Gmail and Microsoft’s Copilot for Outlook evolving fast. Startups like Shortwave and Missive are also moving speedily, embedding smart features directly into inboxes.
But Mehrotra is undeterred. “Email continues to be the dominant communication tool for the world. Professionals spend something like three hours a day in their inboxes. It’s by far the most used work app, foundational to any productivity suite,” he said.
What began as a premium, invite-only service targeting high-performance professionals now finds itself backed by one of the most widely used writing tools on the planet.
Grammarly, with over 40 million daily users and $700 million in annual revenue, is no longer content playing in the margins.
